EP0717206A1 - Foliengaslager mit Folieneinstellelement - Google Patents

Foliengaslager mit Folieneinstellelement Download PDF

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Publication number
EP0717206A1
EP0717206A1 EP95308928A EP95308928A EP0717206A1 EP 0717206 A1 EP0717206 A1 EP 0717206A1 EP 95308928 A EP95308928 A EP 95308928A EP 95308928 A EP95308928 A EP 95308928A EP 0717206 A1 EP0717206 A1 EP 0717206A1
Authority
EP
European Patent Office
Prior art keywords
bearing
foil
bump foil
shaft
bump
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95308928A
Other languages
English (en)
French (fr)
Inventor
William Robert Brown
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Air Products and Chemicals Inc
Original Assignee
Air Products and Chemicals Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Air Products and Chemicals Inc filed Critical Air Products and Chemicals Inc
Publication of EP0717206A1 publication Critical patent/EP0717206A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
    • F16C17/024—Sliding-contact bearings for exclusively rotary movement for radial load only with flexible leaves to create hydrodynamic wedge, e.g. radial foil bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49639—Fluid bearing

Definitions

  • a conventional three pad compliant foil gas bearing modified to provide a gas pressure force created by each pad wherein the pressure forces are spaced approximately 120° from one another resulting in a three lobe compliant foil gas bearing that exhibits increased load capacity and damping when compared to the standard three pad compliant foil gas bearing configuration. It has been found that placing shims under the bump foils of a conventional three pad compliant foil gas bearing achieves the necessary pressure forces thus imparting a three lobed configuration on the rotating shaft. The three lobed configuration permits higher shaft speeds by increasing the stiffness and damping capacity of the prior art three pad compliant gas foil bearing.
  • the present invention provides a compliant foil gas bearing comprising a generally cylindrical journal sleeve housing supporting a shaft, the housing having at least three bump foil assemblies disposed at equiangularly spaced locations on an inner surface of the housing, each of the bump foil assemblies having an end fixed to the sleeve and a free end extending to a location proximate a fixed end of an adjacent bump foil assembly, characterized in that means to create pressure forces from each bump foil assembly are located under a portion of each of the bump foil assemblies proximate the fixed end of each bump foil assembly, whereby the bearing provides gas pressure forces acting at equiangularly spaced locations from one another to stabilize and center the shaft in the bearing during high speed rotation of the shaft.
  • the means creating pressure forces comprises individual shims placed under the bump foil assemblies.
  • each of these shims may be a metal foil 0.001 to 0.004 inches (0.002 to 0.010 cm) thick.
  • the metal preferably is s stainless steel having a minimum surface hardness of 40 measured on the Rockwell C scale.
  • the shims advantageously have a length greater than the width of the bump foil assembly and a width narrower than the length of the bump foil assembly and, usually, one end of that shim is fixed to the housing. The shim can be placed under the bump foil assembly so that it covers 30 to 70% of the length of that assembly.
  • the present invention provides a method of increasing the load capacity and/or damping characteristics of a multi-pad compliant foil gas bearing used to support a shaft for rotation at high speed, comprising establishing gas pressure forces equiangularly spaced apart acting between each pad and the shaft.
  • Foil gas bearing assembly 10 includes a journal sleeve or bushing 12 which supports a shaft 14 for rotation in the direction shown by arrow 16. Disposed on the inside of the sleeve 12 are three bump foil assemblies 18, 20, and 22 consisting of a bump foil 24 covered by a flat foil 26 (assembly 18). Bump foil assemblies 18, 20, and 22 are spaced equally around the inner circumference of the sleeve 12 as shown.
  • air or other gaseous medium is introduced into the space between the sleeve 12 and the shaft 14 to provide the compliant foil gas bearing.
  • the film of air or gas acts as the means to support the shaft 14 during a rotation and provide lubrication.
  • the conventional three pad compliant foil gas bearings load capacity and damping capabilities are low when compared to oil film bearings.
  • a bump foil assembly 50 consisting of a bump foil 52 is fixed to the inner circumference 43 of sleeve 42 at location 54 by a series of spot welds and extends for approximately 1/3 the circumference of the sleeve 42 as shown in the drawing.
  • First or fixed end 56 of the bump foil 52 is fixed to the inner surface 43 of sleeve 42 and the second or free end 58 of bump foil 52 is free to move circumferentially around the inside surface 43 of the sleeve 42.
  • a spacer 60 is spot welded on the first end 56 of bump foil 52.
  • a smooth foil 62 has a first or fixed end 64 spot welded on the spacer 60, the smooth foil extends for a length commensurate with the bump foil 52.
  • the second or free end 76 of shim 70 projects a slight distance beyond the width of the bump foil 52 and the smooth foil 62.
  • the bump foils 52 are provided with a series of longitudinal slits which are shown in dotted line in Figure 4 to accommodate for differential expansion of the bump foil 52 as a shaft load is applied. It is also known in the art, to provide the smooth foil 62 with a surface coating such as EmalonTM 333 supplied by Acheson Colloids Company of Port Huron, Michigan. The coating provides a dry lubricant during start-up and shutdown when shaft speeds are too low to generate a gas film strong enough to support the shaft.
  • Bump foil 52 and smooth foil 62 are made of a nickel alloy sold under the tradename InconelTM and are approximately 0.002 to 0.012 inches (0.005 to 0.030 cm) thick.
  • the shim 70 (shims 34, 36, and 38 of Figure 2) are preferably made from a chromium nickel stainless steel such as AISI type 302 stainless preferably having a surface hardness of at least 40, usually between 40 and 45, on the Rockwell C scale.
  • the shims are approximately 0.001 to 0.004 inches (0.002 to 0.010 cm) thick with the length and width being determined by the size of the pad of the compliant foil gas bearing to which it is applied, e.g., the size and application for which the bearing is intended.
  • a bearing assembly When a bearing assembly, according to the present invention, is installed in a high speed machine such as a turbo expander, the shims act in a manner to convert the standard three pad compliant foil gas bearing into a three lobe compliant foil gas bearing by virtue of the three gas pressure forces acting 120° from each other to stabilize and center the shaft in the bearing.
  • the shimmed bump foil assembly according to the present invention is more compliant which provides more Coulomb damping while the turbo machine is operating under light loads.
  • the assembly increases the stiffness and damping characteristics of the compliant foil gas bearing, thus permitting operation at higher speeds than permitted by prior art compliant gas foil bearings.
  • a turbo expander with prior art gas foil bearings could not maintain stable operation above 39,000 RPM.
  • the turbo expander could operate above 50,000 RPM with only 0.3 mils (8 ⁇ m) total vibration.
  • the expander using bearings has been in continuous operation for almost a year running at a speed of 43,000 to 46,000 RPM.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Support Of The Bearing (AREA)
EP95308928A 1994-12-15 1995-12-08 Foliengaslager mit Folieneinstellelement Withdrawn EP0717206A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US356426 1994-12-15
US08/356,426 US5498083A (en) 1994-12-15 1994-12-15 Shimmed three lobe compliant foil gas bearing

Publications (1)

Publication Number Publication Date
EP0717206A1 true EP0717206A1 (de) 1996-06-19

Family

ID=23401375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95308928A Withdrawn EP0717206A1 (de) 1994-12-15 1995-12-08 Foliengaslager mit Folieneinstellelement

Country Status (2)

Country Link
US (1) US5498083A (de)
EP (1) EP0717206A1 (de)

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19705197C1 (de) * 1997-02-12 1998-12-10 Gerhard Dipl Ing Wanger Gaslagerung eines schnelldrehenden Werkzeugs
US5902049A (en) * 1997-03-28 1999-05-11 Mohawk Innovative Technology, Inc. High load capacity compliant foil hydrodynamic journal bearing
US5833369A (en) * 1997-03-28 1998-11-10 Mohawk Innovative Technology, Inc. High load capacity compliant foil hydrodynamic thrust bearing
RU2137954C1 (ru) 1997-04-03 1999-09-20 Московский государственный авиационный институт (технический университет) Лепестковый газодинамический подшипник
US5915841A (en) 1998-01-05 1999-06-29 Capstone Turbine Corporation Compliant foil fluid film radial bearing
JP4287021B2 (ja) * 2000-04-10 2009-07-01 本田技研工業株式会社 フォイル式流体軸受
US6964522B2 (en) * 2004-01-22 2005-11-15 Honeywell International Inc. Hydrodynamic journal foil bearing system
KR100573384B1 (ko) * 2004-02-14 2006-04-25 한국터보기계(주) 래디알 포일 베어링
US7553086B2 (en) * 2004-07-20 2009-06-30 Honeywell International Inc. Hydrodynamic journal bearing
KR100600668B1 (ko) * 2004-10-18 2006-07-13 한국과학기술연구원 다공성 포일을 갖는 공기 포일 베어링
US7625121B2 (en) * 2005-09-28 2009-12-01 Elliott Company Bearing assembly and centering support structure therefor
CN100532870C (zh) * 2007-01-08 2009-08-26 哈尔滨工业大学 U形杆自控式波纹箔片轴承
CN100451366C (zh) * 2007-01-08 2009-01-14 哈尔滨工业大学 自调式动压气体弹性箔片轴承
US7948105B2 (en) * 2007-02-01 2011-05-24 R&D Dynamics Corporation Turboalternator with hydrodynamic bearings
US7728475B2 (en) * 2007-02-20 2010-06-01 Hamilton Sundstrand Corporation Thermally operated rotatable component restraint system
WO2009089078A1 (en) * 2008-01-11 2009-07-16 Mcvan Aerospace, Llc Reciprocating combustion engine
US8282285B2 (en) * 2009-05-04 2012-10-09 Pratt & Whitney Canada Corp. Bearing support
US8337090B2 (en) 2009-09-10 2012-12-25 Pratt & Whitney Canada Corp. Bearing support flexible ring
US9951784B2 (en) 2010-07-27 2018-04-24 R&D Dynamics Corporation Mechanically-coupled turbomachinery configurations and cooling methods for hermetically-sealed high-temperature operation
US9476428B2 (en) 2011-06-01 2016-10-25 R & D Dynamics Corporation Ultra high pressure turbomachine for waste heat recovery
CN104685183B (zh) * 2012-10-17 2017-11-03 博格华纳公司 一种适合用于支持可旋转轴的气体动压箔片轴承组件
US8783952B1 (en) * 2013-04-03 2014-07-22 Hamilton Sundstrand Corporation Journal bearing sleeve
WO2015175962A1 (en) * 2014-05-16 2015-11-19 Board Of Regents, The University Of Texas System Air foil bearings having multiple pads
CN107289136A (zh) * 2017-07-06 2017-10-24 南阳神鹰装备制造有限公司 一种用于旋转机械的空气悬浮型密封结构
CN111005935B (zh) * 2019-10-30 2021-07-23 珠海格力电器股份有限公司 气体动压轴承及其制作方法、压缩机、风机、泵和机床
US11125109B2 (en) 2020-01-31 2021-09-21 Unison Industries, Llc Foil-air bearing assembly for engine starter
US11686341B2 (en) 2021-02-04 2023-06-27 Emerson Climate Technologies, Inc. Foil bearing assembly including segmented inner foil assembly and compressor including same
DE102021108883A1 (de) 2021-04-09 2022-10-13 Schaeffler Technologies AG & Co. KG Radialfolienlager mit mehreren Tragflächen, Kontaktwinkeldefinition
US11852153B1 (en) * 2023-01-31 2023-12-26 Copeland Lp Foil bearing assembly including perforated inner foil assembly and compressor including same

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2027607A1 (de) * 1969-08-06 1971-02-18 Garrett Corp Hydrodynamisches Stromungsmittellager mit nachgiebigen Elementen
US3893733A (en) 1972-12-13 1975-07-08 Garrett Corp Foil bearing arrangements
FR2352985A1 (fr) * 1976-05-24 1977-12-23 Garrett Corp Palier a fluide hydrodynamique comportant un element de support de lame
US4133585A (en) 1977-08-04 1979-01-09 United Technologies Corporation Resilient foil journal bearing
US4167295A (en) 1977-12-08 1979-09-11 The Garrett Corporation Magnetic thrust force relief for a foil bearing turbomachine
US4262975A (en) 1979-10-01 1981-04-21 Mechanical Technology Incorporated Compliant journal bearing with angular stiffness gradient
US4300806A (en) 1980-04-03 1981-11-17 Mechanical Technology Incorporated Multi-stage support element for compliant hydrodynamic bearings
US4502795A (en) * 1982-09-30 1985-03-05 The Garrett Corporation Foil bearing alignment

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082375A (en) * 1976-12-17 1978-04-04 United Technologies Corporation Dual wedge fluid thrust bearing including wave spring
US4213657A (en) * 1978-12-29 1980-07-22 Mechanical Technology Incorporated Compliant hydrodynamic bearing with tubular support element
US4208076A (en) * 1978-12-29 1980-06-17 Mechanical Technology Incorporated Compliant hydrodynamic bearing with improved support element
US4549821A (en) * 1982-11-17 1985-10-29 Aisin Seiki Kabushiki Kaisha Foil bearing
US4465384A (en) * 1983-02-28 1984-08-14 Mechanical Technology Incorporated High load, whirl free, foil journal bearing
JPS60101316A (ja) * 1983-11-07 1985-06-05 Hitachi Ltd 軸受

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2027607A1 (de) * 1969-08-06 1971-02-18 Garrett Corp Hydrodynamisches Stromungsmittellager mit nachgiebigen Elementen
US3893733A (en) 1972-12-13 1975-07-08 Garrett Corp Foil bearing arrangements
FR2352985A1 (fr) * 1976-05-24 1977-12-23 Garrett Corp Palier a fluide hydrodynamique comportant un element de support de lame
US4133585A (en) 1977-08-04 1979-01-09 United Technologies Corporation Resilient foil journal bearing
US4167295A (en) 1977-12-08 1979-09-11 The Garrett Corporation Magnetic thrust force relief for a foil bearing turbomachine
US4262975A (en) 1979-10-01 1981-04-21 Mechanical Technology Incorporated Compliant journal bearing with angular stiffness gradient
US4300806A (en) 1980-04-03 1981-11-17 Mechanical Technology Incorporated Multi-stage support element for compliant hydrodynamic bearings
US4502795A (en) * 1982-09-30 1985-03-05 The Garrett Corporation Foil bearing alignment

Also Published As

Publication number Publication date
US5498083A (en) 1996-03-12

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